Yes, I was cheating occasionally due to severe cravings, so it was about 80% beef. (All beef meals plus occasional carby snack).

The adaptation period was very rough (about 2 weeks). 3-4 weeks in I began to feel amazing. I started with steak, switched to mincemeat (cheaper, and more fat -- you need a lot of fat if you cut out carbs), and now switched to veganism due to being broke.